(Division and Sum of Graphs)

1. Divide an equilateral triangle into eight and nine triangles with the same shape and size.

(Mathematical problems in the game)

2. There are nine cards, namely 1, 2, 3, 4, 5, 6, 7, 8 and 9. Party A and Party B take turns to take one. Who is it?

The number of the three cards in your hand adds up to 15, and whoever wins wins. What are the countermeasures to ensure unbeaten?

(hypothetical question)

3. A batch of steel, loaded by 45 trucks; If you load a big truck, you need 36. Every car is very big.

The truck is loaded with 4 tons more than each pickup truck. How many tons is this batch of steel?

There has been a change (in terms of inclusion and exclusion)

4. In a club, there are 69 people who can play China chess and 52 people who can play chess.

There are 20 people who can't get off, and 15 people can get off. How many people are there in this club?

(restore problem)

Party A, Party B and Party C each have 72 yuan money, so what Party A gives is the same as that given by Party B, and what Party B gives is the same as that given by Party C..

Give more money to C, and then the money of three people is the same. How much do A, B and C have?

(Travel problems)

6. A train is 360 meters long and travels at 15 meters per second. It takes 40 seconds for the whole train to pass through a cave.

How many meters long?

(general questions)

7. There are three numbers, the average of A and B is 45, the average of A and C is 4 1, and the average of B and C..

It's 43. What are these three numbers?

(profit and loss problem)

8. Young Pioneers go to plant trees. If each person plants 5 trees, there are still 3 trees that are not planted; If the two of them plant four trees and the rest plant six trees, these saplings will be finished. Q: How many young pioneers participated in tree planting activities and how many saplings were planted?

(Normalization)

9.3 The tractor plows13500m2 every day. How many square meters of farmland can be cultivated by adding two identical tractors every day?

(odd and even)

10.4 1 The students took a quiz with 20 questions. The scoring method is: basic score 15, one question with 5 correct answers, no answers 1, and wrong answers 1. Is the sum of all the students' scores odd or even?